Bug 1954804 (CVE-2019-25042)

Summary:	CVE-2019-25042 unbound: out-of-bounds write via a compressed name in rdata_copy
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aegorenk, akhaitovich, paul.wouters, pemensik, pj.pandit
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	unbound 1.9.6	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in unbound. An out-of-bounds write in the rdata_copy function may be abused by a remote attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-18 20:39:21 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1859933, 1968662, 1968663, 1968664
Bug Blocks:	1954811

Description Guilherme de Almeida Suckevicz 2021-04-28 19:11:48 UTC

Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy.

Reference:
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/

Comment 1 Riccardo Schirone 2021-05-06 13:11:30 UTC

Upstream patch:
https://github.com/NLnetLabs/unbound/commit/6c3a0b54ed8ace93d5b5ca7b8078dc87e75cd640

Comment 3 Riccardo Schirone 2021-05-06 14:57:36 UTC

Statement:

According to the original report there are checks happening before the affected function that make this not exploitable. For these reasons its Impact is Moderate.

Comment 5 errata-xmlrpc 2021-05-18 15:37:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1853 https://access.redhat.com/errata/RHSA-2021:1853

Comment 6 Product Security DevOps Team 2021-05-18 20:39:21 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-25042

Comment 8 errata-xmlrpc 2022-02-22 15:14:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2022:0632 https://access.redhat.com/errata/RHSA-2022:0632